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Prasant,
I agree with your choice. Either (1) or (2) is sufficient to get the values for x. By the way, recheck the solution you found for x from (1). There's a little mistake in the values of x you found.

Re: DS practice #2 [#permalink]
05 Aug 2003, 07:05

Konstantin Lynov wrote:

What is the value of x ?

1) sqrt(x^4)=9; 2) The average (arithmetic mean) of x^2, 6x and 3 is -2.

Hmmm.
these question look straight out of the GMAT 800 book.
_________________

Best,

AkamaiBrah Former Senior Instructor, Manhattan GMAT and VeritasPrep Vice President, Midtown NYC Investment Bank, Structured Finance IT MFE, Haas School of Business, UC Berkeley, Class of 2005 MBA, Anderson School of Management, UCLA, Class of 1993

Re: Prakuda's reply [#permalink]
05 Aug 2003, 07:15

Prakuda,

From your answer it follows that either 1 or 2 is sufficient. In other words, it follows that D is the answer. However, it is not. You might need to review your approach to the first choice.

sqrt x^4=9 can be written as x^4/2=9. Simplifying gets us x^2. Now, x can be +3, -3

Now, B is sufficient since the quadratic equation has only one root.
_________________

Prasant, I agree with your choice. Either (1) or (2) is sufficient to get the values for x. By the way, recheck the solution you found for x from (1). There's a little mistake in the values of x you found.

Agreed Prakuda, x is +3 or -3.... I stand corrected